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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd95f0c03772286bd13950724f0ba5ced7ec8c9c078d9c6071ba733e3aa2bfbf' 
  AND token = 'uyaXuCVlwytTe0GMwnPkHFctWGujNT25Hj8j8TvgeFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}